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习题练习：Physics Unit6: Work and Energy
本习题练习来源于51fly国际课程 (https://51fly.win)，是在线习题练习的打印版，您也可以访问本平台网站(https://51fly.win/)直接在线完成(注册并登录账号后在首页左侧输入试卷号 60 即可在线作答)，，作答电子化后可随时回放，查看每题答案与详细解析，搜藏保存任意题目；教师使用本平台可以抽题组卷或一键复制他人试卷，布置为在线考试或在线作业，全自动判分成绩一键排序导出，省时省力。本试卷的直接作答链接 https://51fly.win/test60.html
 作者: physics  发布日期: 2022-07-28 12:33    总分: 95分  得分: _____________

答题人: 匿名未登录  开始时间: 22年07月26日 13:45  切换到: 整卷模式

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1#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the correct unit of work expres0q)(s:qcnswnnxa8h 3x ll bm+r:/, md sed in SI units?

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2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Can work be done on a system if thnk 6y92bav n85ea1i ccere is no motion?

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3#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If you push twice as hard against a stationary brick wall, the amouuem4i wl9l 9;bnt of work you di4 l 9w;luem9bo

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4#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 50-N object was lifted 2.0 m vertically and is being held there. p(quvz *-z9apy41qfa How much work is being done in holp9a qpv *yu1zqfa(z4 -ding the box in this position?

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If you walk 5.0 m horizontally forward at a constant velocity carryi1i ( rvclb,s8ing a 10-N object, the amount( isvbc1ri8 l, of work you do is

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6#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A container of water is lifted vertically 3.0 m then reau u +8 )ut;u.bhm1mw)mh9a hqturned to its original position. If the totalah9u1 +mtma u mq ).)hh;u8uwb weight is 30 N, how much work was done?

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Does the centripetal force acting 2a zl,s:+u:x dqrmo9e o, lc:von an object do work on the object?

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You throw a ball straight up. Compare the sign of the work m5 m7b:5 jzqlhji7vs*done by gravity while the ball goes up with*v jhi5m77l j:s 5bqmz the sign of the work done by gravity while it goes down.

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The area under the curve, on a Force versus position (F vs. x) gc, mkb6ctvbdsr h9r bw5b)606raph, represents60)vc96sb bcm6r w,tb 5hdrkb

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  On a plot of Force versus position (F vs. x), what represents the work done 9z(x-b xuc13fh+hhuw by the force f-+hhhbwu 3x9xz1(u c F?

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The quantity $\frac{1}{2} \; mv^2$ is

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the net work done on an object is p8e 3abif tl t;8rj/fh+w m4sih,hl9( mositive, then the object's kinetic energy

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the net work done on it7g;2c4cxt6t2v jry7qik-n(d 2 v q 5vwwkx(an object is negative, then the object's kinetic energy

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the net work done on an object is zero, then the object's kip0xz+ 9)u zxab; ue2ra(h 0hsbnetic energy

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A truck weighs twice as much as a car, and is moving at twf k(c zsg04 j.iglqg0rbs-8k:ice the speed of the car. Which statement is true abou g0kk gcq( 4grf:j.-i0blsz8st the truck's kinetic energy compared to that of the car?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Car J moves twice as fast as car K, and car J has half s(t++x tcrvt4l- v.wothe mass of car K. The kinetic energy of car J, compared to car x+so4trl w(v c+.tv-t K is

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17#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An object hits a wall and bounces back with half of its:p37loozu v .l original speed. What is p3:l7 .olvzuothe ratio of the final kinetic energy to the initial kinetic energy?

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18#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A brick is moving at a speed of 3 m/s and a pebble is moving at a speed of 5 o0n;ghv9 cio; 1.bfoem/s. If both objects have the oh9;e1o. icgv 0obnf; same kinetic energy, what is the ratio of the brick's mass to the rock's mass?

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19#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 4.0-kg mass is moving with speed +xdmmk7,fc;a .x d4zl 2.0 m/s. A 1.0-kg mass is moving with speed 4.0 m/s. Both objects encounter the same constant braking ,;+zldmcx7mxa d4k. fforce, and are brought to rest. Which object travels the greater distance before stopping?

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20#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You slam on the brakes of your car in a panic, and skid a cert6 - aq-jc d1ld4i5m cbuqc3n2bain distance on a straight, level road. If you had been tr bdc362cqd5 4abnljmq -c1ui-aveling twice as fast, what distance would the car have skidded, under the same conditions?

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21#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A planet of constant mass orbits the Sun4wga0i5 1rsb s2ebd5d in an elliptical orbit. Neglecting any friction effects, what happens 2bdr 4i05 gbdass5 we1to the planet's kinetic energy?

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22#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
State the work-energy prin 5ktz4co t6mxo), yas4ciple.
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23#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The quantity mgy is

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24#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The quantity $\frac{1}{2} \; kx^2$ is

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25#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Is it possible for a syst j,,)fdip)oxwe +/wg kem to have negative potential energy?

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26#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An object is released from rest a height h above the v8.x u2q7beac ground. A second object with four times the mass of the first if released from the same height. The potential energy of the second object comp7bq u.cevx8a 2ared to the first is

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27#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 0.200-kg mass attached:- nmn.38tnu s de /+ba ruajrl4y(i30w 8drqs to the end of a spring causes it to stretch 5.0 cm. If another 0.200-kg mass is added to the sprim4 -naq+r nr(iu /eds8j.dn3r : 8a0blwyu3stng, the potential energy of the spring will be

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28#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The total mechanical -8,*3 duyqstrixsk a)*eyz3qenergy of a system

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29#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An acorn falls from a tree. Compare its kinetic energy c2m61rm4p/c )c rn1j3chlu:bb ty g)pK, to its potential energyucg: ) rcmcn64jpp/ )lbtc2bhyr1 m31 U.

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30#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Describe the energy of a car drivingh527w ecvjn k8 up a hill.

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31#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A lightweight object and a verxjb0+5dy;ic fj j/s 0py heavy object are sliding with equal speeds along ai xcd;+/jpj ysjf5b00 level frictionless surface. They both slide up the same frictionless hill. Which rises to a greater height?

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider two masses gii1vp*w 7oesxu : lm7gj2( 1k$m_{1}$ and $m_{2}$ at the top of two frictionless inclined planes. Both masses start from rest at the same height. However, the plane on which $m_{1}$ sits is at an angle of $30^{\circ}$ with the horizontal, while the plane on which $m_{2}$ sits is at $60^{\circ}$. If the masses are released, which is going faster at the bottom of its plane?

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33#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
State the principle of cooryi1o80m xc .nservation of mechanical energy for conservative forces.1cm.8xrooi0y
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34#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A ball falls from the top of a building, through the air ux1 x(8rp.w/b*sa yzdjj, qa 3yj-*k e(air friction is present), to the ground below. How daek 3 (/psxrxj-* dw *b.qjz,uy8aj1yoes the kinetic energy (K) just before striking the ground compare to the potential energy (U) at the top of the building?

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35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A ball drops some distance and gains 3co 8v9ry5ivp. 0 J of kinetic energy. Do not ignore air resistance. How much graviic8vp9yv 5or .tational potential energy did the ball lose?

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教师可以抽题组卷或一键复制他人试卷，布置为在线考试或在线作业，全自动判分成绩一键排序导出，省时省力
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36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A ball drops some distance and 6xq lv)nr*x. lloses 30 J of gravitational potential energy. Do not ignoq xx*)llnr 6.vre air resistance. How much kinetic energy did the ball gain?

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37#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
State the law of conservation ody1r wr,24zt sf energy.
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38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The quantity Fd/t isgne ewe,/2ob:9yfn ; j

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教师可以抽题组卷或一键复制他人试卷，布置为在线考试或在线作业，全自动判分成绩一键排序导出，省时省力
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39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the correct unit of power expressej0 bf h497lf.:hphpmgd in SI units?

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Of the following, whguu o9:4(sts vich is not a unit of power?

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41#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Compared to yesterday, you did 3 times thk).ss(ms 2 javht hs)3e work in one-third the time. To do so, your power output )sksvsastm. 2 jh()3hmust have been

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42#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  To accelerate your car at a constant acceleratio 1g6wjbv 7)9b9ak +yt)ooi zcon, the car's engine must

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43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An object is lifted v;;rnqr- lh y8gertically 2.0 m and held there. If the object weighs 90 N, how much work was done in8-r; h rq;lyng lifting it?

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You lift a 10-N physics book up in the air a distance of 1.0 m, al 7 ddcizpl;qxp(8q:- .*dvqnt a constant velocity of 0.50 m/s. What is the work done by the weight of lqld qpv (zdc*7nd; i:.- p8xqthe book?

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45#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 500-kg elevator is pulled upward with a constant force of 5500 N for a dxf 5/ihkr59u32lep;qa4e n :cb ,wvobistance of 50.0 m. What is the work don5r9i4 w hvl:q2fbu;c5 k eae3/x, npobe by the 5500 N force?

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46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 500-kg elevator is pulled upward wi +tgow0-; kkafh2jcm*th a constant force of 5500 N for a distance of 50.0 m. Whatft2khac-j*gm+wo;k 0 is the work done by the weight of the elevator?

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47#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 500-kg elevator is pulled upward with jk;8c lrnqv46a constant force of 5500 N for a distance 8vn;k r4 jlq6cof 50.0 m. What is the net work done on the elevator?

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48#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 30-N box is pulled 6.)imc gg ygd 6k(26zi9n0 m up along a $37^{\circ}$ inclined plane. What is the work done by the weight (gravitational force) of the box?

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 4.00-kg box of fruzru(x5 ) 6ygdvit slides 8.0 m down a ramp, inclined at $30^{\circ}$ from the horizontal. If the box slides at a constant velocity of 5.00 m/s, what is the work done by the weight of the box?

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50#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Matthew pulls his little sister Sarah in a sled on an icy surface (assume no .v5/rnni1 v fjfriction), with a for ij5vn/r v.fn1ce of 60.0 N at an angle of $37^{\circ}$ upward from the horizontal. If he pulls her a distance of 12.0 m, what is the work done by Matthew?

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51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A force moves an object in the direction of ti+ nfl6r: f)hkhe force. The graph in Fig. 6-1 shows the force versus the6)r nl:f+fi kh object's position. Find the work done when the object moves from 0 to 2.0 m.


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52#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A force moves an object in the direction of the force. The graph in Fig. 6-1 s/ aacv;bxyzbvqg4 +4+ hogvy;bqab+/cx+ v 4za4 ws the force versus the object's position. Find the work done when the object moves from 2.0 to 4.0 m.


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53#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A force moves an object in the direction of the force. The gz buih4bev5+5lf. 1w))g uqe+oasg 9 mraph in Fig. 6-1 shows the force versus the object's position. g5bauh bgl )z5e 9i qvesf41+o+m)u.wFind the work done when the object moves from 4.0 to 6.0 m.


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54#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A force moves an object in thxn8syfhd( v7 m h.zj(5a.2 xb o+cf-sue direction of the force. The graph in Fig. 6-1 shows the force versus the object's position. Find the work2a mj vu8sf n(.czs+ (xfyhb5o -7x.dh done when the object moves from 0 to 6.0 m.


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55#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal force of 200 N is applied to move a 55-kg cart (indu0v-g xx p.ft6qqf70itially at rest) across a 10 m level surface. What is the final kinetic energ6p.0vg0xd- tufxqf q7y of the cart?

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56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal force of 200 N is appl1.tek10swi nxt* ew2lied to move a 55-kg cart (initially at rest) across a 10 m level surface. What is the final speed of the carxit11 seetln0*w2w.k t?

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57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-kg mass is moving wit)hh)e eg--y :dexpsjrfui/: 9h a speed of 5.0 m/s. How much work is required to stop the may)9 h-hexj)-:d:pg ir/fs eu ess?

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If it takes 50 m to stop a car initially moving at 25 m/s, what distance is reqnrck tdwt1/v-vzr4*xekf4; - znm6 (v uired to stop a car moving at6 ev n;zf*rk/zt(wx41m-4-t knrdvcv 50 m/s under the same condition?

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59#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A spring-driven dart gun propels agawj njmgp5* ,w+;pl0 10-g dart. It is cocked by exerting a force of 20 N over a distance of 5.0 cm. With what speed will the dart leave tgajlpp50*w,gwmn+ j; he gun, assuming the spring has negligible mass?

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60#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 100-N force has a rtzbs3 b/ ti*3( jqyx0horizontal component of 80 N and a vertical component of 60 N. The force is applied to a box which rests on a level frictionless floor. The cart starts from rest, and moves 2.0 m horizontally along the flo0y rq 3ttzb/ (*bjsx3ior. What is the cart's final kinetic energy?

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61#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An arrow of mass 20 g is shot gbfa,yz 7s 3cmuzs/ 84horizontally into a bale of hay, striking the hay with a velocity of 60 m/s. It penetrates a depth of 20 cm before stopping. What isaz47cbz /u sm ,8sgy3f the average stopping force acting on the arrow?

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62#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 15.0-kg object is moved from a height of 7.00 m above a floor to a heiggbn.kw9 ntru81,p0we *3e0r e.crycxht of 13.0 m above the floor. What is the change9n rk r3x1u8r.tgey,eebnw * 0.cc0pw in gravitational potential energy?

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63#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 400-N box is pushed up an inclined plane. xz,zl 02h;czwb2 o*sf The plane is 4.0 m long and rises 2.0 m. Izl02zho2 ;fczbx*s ,wf the plane is frictionless, how much work was done by the push?

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64#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-kg mass, hung onto a spring, causes the spring 7 f )0cdzs;u9g1id vapto stretch 2.0 cm. What is the spring sd091 u)a;fi zvgpc7dconstant?

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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A spring is characterized by a spring q tfou;5*ii q .k,*;vkhxdjn/ constant of 60 N/m. How much potential energy does it store, when stretched by ,*fd/h nju *5oixqvtk;i;kq.1.0 cm?

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Calculate the work required to compress an initially uncompressed spring/d0du6aol9 xt with a spring constant of 25 N/m by 10 cmdaoud 0xt9l/6 .

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67#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What work is required to stretch a spring of s(n/n3mnk ) wdd5qdkem 9uk1i ;pring constant 40 N/m from x = 0.20 m to 0.25 um(k9w1 d)dknnmk qe;ni 5/d3m? (Assume the unstretched position is at x = 0.)

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68#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A spring with a spring constant of 15 N/m is initially compressed by 3.0 cm. 05bj2gokxm5 s:fr a(d How much work is required to comds2gm5f: 0or k(bjxa5press the spring an additional 4.0 cm?

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69#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 60-kg skier starts from rest from the top of a 50-m high slope. What isb(tfwnu rz1wg82ye 6 * the speed of the slierrwt z* 2(w6u1g8ne fby on reaching the bottom of the slope? (Neglect friction.)

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70#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A skier, of mass 40 kg, pushes off the top of a hill with an initial speed of 48-gq/ ,x/ cse yf4 tlaj//ldbo.0 m/s. Neglo yc4a8qf- l/x,b/tdsl j//geecting friction, how fast will she be moving after dropping 10 m in elevation?

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71#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An object slides down a frictionless inclined plane.+ thewh9 : *izac6/g1vrmki lvc4gx01is qc*( At the bottom, it has a speed of 9.80 m/s. What is the vertical height of t9 zqg at+:rcevlhhici*11w g0c (kx6/ vsi4m* he plane?

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72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 1.0-kg ball falls to the floor. When it is 0.70 m above the floor, its ;)kpjter e hx4mp 81u-potential energy exactly equals its kinetic energy. Hor;xu-mt) e p h4kpej18w fast is it moving?

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A toy rocket, weighing 10 N, blasts straight up from ground hhzuzl r2 /9 wu(5yu.elevel with a kinetic energy of 40 J. At the exact top of its trajectory, its total mechanical energy is 140 J. To h uulw(zz r2h9/ue5y.what vertical height does it rise?

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74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A projectile of mass m leaves the ground with a kinetic energhec;.np +:x coy of 220 J. At the :hopncc+e. x ;highest point in its trajectory, its kinetic energy is 120 J. To what vertical height, relative to its launch point, did it rise?

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75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A roller coaster starts from rest at a point 45 m above the bottom of a ro7t:ks+v6d2 ywypvn(n/ uz/dip (See Fig. 6-2). Neglect friction, what will be the speed/ ydt(+y7s nv:nowkz6/v2pur of the roller coaster at the top of the next slope, which is 30 m above the bottom of the dip?


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76#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A roller coaster starts with a v7n y cy;b0wr;m2 -lvespeed of 5.0 m/s at a point 45 m above the bottom of a dip (See Fig. 6-2). Neglect friction, whlr vw-7bm;y 0 e2ncvy;at will be the speed of the roller coaster at the top of the next slope, which is 30 m above the bottom of the dip?


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77#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A roller coaster starts at a point 30 m above the bottom of e0; jthbce (+ha dip with a speed of 25 m/s (See Fig. 6-2). Neglect fr;be hh+j0t(ce iction, what will be the speed of the roller coaster at the top of the next slope, which is 45 m above the bottom of the dip?


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78#
 
  What is the minimum speed of the ball at7z1sc)m by9f:(mnc -;wiqw nm the bottom of its swing (point

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79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A:2.2 m/s

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80#
 
  难度:2

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81#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pendulum of length 50 cm is pulled / r2fk*rh):bc ftjzb0cz:6ld 30 cm away from the vertical axis and released frordf2hlcz:tkc6*b b:0/ r fjz) m rest. What will be its speed at the bottom of its swing?

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82#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 1500-kg car moving at 25 m/s hits an initially uncj o 89s2q/0oh:toz-7yp czqr m) (0 vd:zsuyccompressed horizontal spring with spring constan8- z/mr 2 0qs(cjchdtvs)c9o0uz 7oyy :o :qpzt of $2.0 \times 10^6 \; N/m$. What is the maximum compression of the spring? (Neglect the mass of the spring.)

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A driver, traveling at 22 m/s, slows down her 2000 kg car to stop for a sqingolbie r/4m5af9-4 (-bn red light. What work is done by the frio -e(5nq9 nisag/lr4im4b -fbction force against the wheels?

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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The kinetic friction force betweent1n5wkfqavoe-,+pbe- : fz7o a 60.0-kg object and a horizontal surface is 50.0 N. If the initial speed of the object is 25.0 m/s, what :o -f17peb5en,qa vw+- fztkodistance will it slide before coming to a stop?

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85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 12-kg object is moving on a rough, z6), soy9tos.nx j hj9.bi6zgu-ays 4level surface. It has 24 J of kinetic energy. The friction force on it is a constant 0.50 N. How far willyyuzogotz)6as9jibs. j9.nxh s6,4- it slide?

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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A force of 10 N is applied horizontav v1f.kn c1u isba h48+mdnfr5g9/yt*qt as-)lly to a 2.0-kg mass on a level surface. The coefficient of kinetic friction bet5.1yv )d8 ffrbuva qm st9gn/tn-hki+cs*a4 1ween the mass and the surface is 0.20. If the mass is moved a distance of 10 m, what is the change in its kinetic energy?

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87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 60-kg skier starts from res,3lpj:;x .v-h)wp os ukhf9wgqpad11t from the top of a 50-m high slope. If the work donw.1; -1qs9kf u, hvl)oaxjw p:gp p3hde by friction is $-6.0 \times 10^{3} \; J$, what is the speed of the skier on reaching the bottom of the slope?

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88#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An 800-N box is pushed up an inc i,-irs-i )hovlined plane. The plane is 4.0 m long and rises 2.0 m. It requires 3200 J of work to get the hv) iior,-- isbox to the top of the plane. What was the magnitude of the average friction force on the box?

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89#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 2.0-kg mass is released from rest at the t e0owf6e nvxfj/*6xs5 op of a plane inclined at 20e above horizontal. The coefficient of kinetic fo0we6njf v s6e*x x/5friction between the mass and the plane is 0.20. What will be the speed of the mass after sliding 4.0 m along the plane?

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90#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 30.0-N stone is dropped from a heigh2: / dmya;ofivt of 10.0 m, and strikes the ground with a velocity of 7.0:a i;my /fvd2o0 m/s. What average force of air friction acts on it as it falls?

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91#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what rate is a 60.0-kg boy using energy when he runs up a flight of fe)fznn9b,hnc e c.m 2:9ol4dstairs 10.0-m high,2bc.e nh4cz9f nn,9 m:f leo)d in
8.00 s?

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92#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-N force is needed t./sszs)xr:u; kq6 zbr o move an object with a constant velocity of 5.0 m/s. What uzs.k s s z:brx;6/)qrpower must be delivered to the object by the force?

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93#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  How many joules of energy are used by a 1.0ij26e svadz byp-c5( ds9u90z hp motor that runs for 1.0 hr? (1 hp = 746 W)60p9-usd z(d2z 5vas9 beicyj

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94#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A cyclist does work atxg:5o 8a)es mw the rate of 500 W while riding. How much force does her foot push witha5o)m 8g :sxwe when she is traveling at 8.0 m/s?

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95#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 1500-kg car accelerates from 0 to 25 m/s in 7.0 s. What is the average power +(s jcp ggz1pyo4mr 50delij5pm yg4 s0(o g1przc+vered by the engine? (1 hp = 746 W)

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